Growth and Scintillation Properties of Large Size Thallium-Doped Sodium Iodide Crystals

Abstract

Abstract: A large NaI(Tl) crystal with a volume of 4 L was grown by Bridgman method. The crystal was tested by X-ray powder diffraction and UV-Visible near-infrared transmission spectroscopy. The results show that the crystal has a single phase and the transmittance is higher than 75% at 600~1 600 nm. The results of inductively coupled plasma emission spectroscopy show that the concentration of Tl ions in the crystal gradually increases from head to tail. After forging, cutting, grinding, polishing and packaging, NaI(Tl) crystal blank was made into square crystal with 100 mm×50 mm×400 mm. The scintillation property measurement shows that the average energy resolution of crystal is 7.9% under the excitation of ¹³⁷Cs radioactive source, and the relative light output and energy resolution at different locations are different.

Key words: NaI, scintillator crystal, Bridgman method, crystal growth, transmittance, energy resolution, relative light output

CLC Number:

O782

LI Maolin, XU Wusheng, ZHANG Bin, TIAN Dongsheng, YIN Zurong, ZHANG Zhenxi, JIA Yongchao, XU Zhaopeng. Growth and Scintillation Properties of Large Size Thallium-Doped Sodium Iodide Crystals[J]. Journal of Synthetic Crystals, 2023, 52(1): 17-24.

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